For adiabatic process P
1+1/
/T
is constant
So for any gas T final = T initial*(0.5)^
1+1/
Gamma for mono atomic gas is 5/3 and for diatomic gas is 7/4
As initial temperature of both gases is same so for final temperature of both gases are
T_mono/T_di=(0.5)^8/5/(0.5)^11/7=0.5^(1/35) So T_mono <T_di
So B will have higher temp